NAME:__________________________________
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DNA Structure Worksheet
Use your DNA structure notes and Chapter 17 to answer these questions
1. What do the letters DNA stand for?
2. DNA is a polymer, which means that is made up of
many repeating single units (monomers).
What are the monomers called?
3. The “backbone” of the DNA molecule is made up of
two alternating components, what are these?
4. There are four different variations of these monomers
(four different bases), what are the names of those bases?
5. These bases are of two different types of molecules: purines and pyrimidines. Purines have
_______________________ ring(s) in their structure, and pyrimidines have _______________________ ring(s) in
their structure.
6. The two bases that are purines are _____________________ and ________________________. These bases are
comprised of ___________ rings.
7. The two bases that are pyrimidines _____________________ and ________________________. These bases are
comprised of ___________ rings.
8. Based on this information, scientist could predict that the base _______________________ pairs with
_______________________ and the base _______________________ pairs with _______________________ in the
formation of the DNA molecule.
This is called complementary base pairs. Thus one strand of DNA is complementary to the other
strand (opposite/matching).
9. The bases are paired by _______________________ bonds along the axis of the molecule.
NAME:__________________________________
10. Draw the basic structure of a nucleotide with its three parts.
11. Write the complementary sequence to following DNA strand:
12. Use the image at the right to complete the follow:
Circle a nucleotide.
Label the sugar and phosphate.
Label the bases that are not already labeled
13. On the Following Page, color the DNA structure.
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NAME:__________________________________
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Step 1:
Color Each Deoxyribose sugar
RED
Color Each Phosphate group
BLUE
Step 2:
Step 3:
Color the _____ hydrogen
bonds between A and T
BLACK
Learve the ____ hydrogen
bonds between G and C
WHITE